20002043431 has 4 divisors (see below), whose sum is σ = 20002709592. Its totient is φ = 20001377272.

The previous prime is 20002043423. The next prime is 20002043437. The reversal of 20002043431 is 13434020002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20002043431 - 2³ = 20002043423 is a prime.

It is a super-2 number, since 2×20002043431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002043399 and 20002043408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002043437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285805 + ... + 348838.

It is an arithmetic number, because the mean of its divisors is an integer number (5000677398).

Almost surely, 2^20002043431 is an apocalyptic number.

20002043431 is a deficient number, since it is larger than the sum of its proper divisors (666161).

20002043431 is an equidigital number, since it uses as much as digits as its factorization.

20002043431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666160.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 20002043431 its reverse (13434020002), we get a palindrome (33436063433).

The spelling of 20002043431 in words is "twenty billion, two million, forty-three thousand, four hundred thirty-one".